\documentclass{article}
\usepackage{amssymb,amsmath,parskip}
\usepackage{graphicx}
\title{\textbf{A+B}}
\author{TIMUS JUDGE}
\begin{document}
\maketitle
\begin{center}
Memory: 1 MB\\
Time: 1 seg.\\
Source: 1 bytes\\
\end{center}
\section*{Descripcion}
\input{description.tex}
\section*{Entrada}
\input{input.tex}
\section*{Salida}
\input{output.tex}
\section*{EjemploEntrada}
\texttt{\input{sample_in.tex}}
\section*{EjemploSalida}
\texttt{\input{sample_out.tex}}
\end{document}
